Arc-lamp.



R. FLEMING & GFA. B. HALVORSON, JR.

ARG LAMP.

APPLICATION FILED NOV. 16,1903'.

Patented July 6, 1909.

8 SHE'ETBSHEET 2;

4 9 7 w m J .l 6/ 7 .F w m m m Witrfisses:

Inventors Rlchard Flew-1mg Cromw II )1 B.Halv rson,dr;.

. ranged that it will not be consumed by. the I heat of the arc, and

i trated an embodiment of our invention.

-- of the lamp viewed from a have invented certain new improvement of"arc amps.

- illumination comes all permanent gases, as 1s operation of the. lamp.

furnish the major portion of the terize our inventionwill be'pointed outwith globein section to disclose sectional elevation showing the lampmech- PATENT ornron.

TTNITED' STATES v I i m, or rynmnassaonusnrrs,

RICHARD FLEMING AND CROMWELL A.

COMPANY, A CORPORATION OF NEW YORK.

ASSIGNORS TO GENERAL n'tnc'rnro ABC-LAMP.

Specification of Letters Patent. Patented July 6, 1909. Serial No.181,332.

Application filed November 16, 1903.

Referring to the drawing, lamp cap or top on the upper side ofwhichsuitable means are provided by which the lamp may be suspended. From theunder side of the cap or top 1 an integrally'formed tubular boss 2. depThis boss is threaded interiorly per end of a short metal tube 3, as isearly shown in Figs, 1, 2 an drawings. Theboss 2 has a seriesof-apertures 4 formed in it. The lower end'of the tube 3 is alsothreaded to engage the upper end of the interior-1y threaded cylinder 5extending through and integrally connected to a circular memberv 6. Theupper end of a section of metal tube 8 is threaded into the lower end ofthe cylinder 5., The section 8, which is similar to section 3., exceptthat it is considerably longer, its lower ends to engage an interiorlythreaded tubular boss 9, projecting u ward the disk-shaped platform 10.T is surrounded by a layer 11 of material which is an insulator both ofheat and electricity.

A tube section 12 of metal is secured to the under side of'platform 10.,and extends in line and in "open communication with the sections 3 and8. In the construction which we have shown in the drawings,.the upperend of the section 12 is provided with a flange 13, whi h abuts againsta 'metallic washer 14, secured to the platform 10 by a air of screws 15.The screws 15 areinsulated from the platform 10 in any suitable manner,and a layer 16 .of the insulating material is interposed between thewasher '14 and the under side of the platform 10 Clamping nuts 17 on theends of the screws T 0 all whom it may concern:

Be it known that we, RICHARD FLEMING, and CRoMwnLL A. B. HALvoRsoN, J12,citizens of the United States, residing at Lynn, county of Essex, Stateof Massachusetts,

and useful Imof which the folprovements in Arc-Lamps,

owing is a specification. I

The object of our resent invention is the c More particularly ourinvention relates to are lamps in which the major portion of theillumination from the lamp is given by a flaming or luminous are, asdistinguished from those in which practically all of the from electrodesheated to incandescence. With these lamps the roducts of combustion fromthe are are not i substantially the case where carbon electrodes areemployed, but contain matter whi *h condenses to solid form upon contactwith suitable condensing surfaces. This necessitates a lamp arranged sothat the solid matter cannot be deposited where it will clog up orotherwise hurt the As the incandescence of the electrodesis not reliedupon to illumination often. found desirable to of good conand arof thelam it 18 form one o the electrodes out ducting "material soproportioned our invention also comprises a novel construction andarrangement of this electrode.

The many. novel features which characarticularity in the claims annexedto and orming a part of this specification.

For a better understanding of our invenbe had to the accom-v panyingdrawings in which we have illusagainst. the washer 14 and to theplatform 10. Preferably open ended slots 18 are formed in the flange 13through which the screws pass. This moval of the tube 12 from-theplatform 10 'whenever it becomes desirable. With the constructionemployed, be seen that Ofthe drawings, Figure 1 is'a perspective view ofan arc lamp with the casing and the mechanism of Fig. 2 is anotherperspective view different position Fig. 3 is a it will the lamp;

is at the same time insulated therewhile it from. at opposite ends ofthe lower end of the secanism; Fig. 4 is a diagram illustrating the tion12.-- A somewhat massive arc-shaped circuits of the lamp; and Fig. 5 isapartial piece'21 of thermally and electrically consectional elevationand Fig. 6 is a erspecducting material, such as copper, tive viewillustrating an auxiliary e ctrode considerable heat-dissipatingcapac1ty,p.asses scraping mechanism. through these slots and forms thenon-conwith the'case and globe removed;

--15 areemployed for holding the flange 13 facilitates a ready re-- 1represents a to receive the threaded d 3 of the is also threaded at esection 8 the section 12 is secured to the platform 10 having a downwarsuming ositive electrode of the lamp. The arc on w iich this piece ofmetal 21 is formed is practically 180 degrees. A pair of bowed pieces ormembers 22, pivoted at their iniddle points to op osite sides of thetube section 12, have tie ends of the arc-shaped electrode 21 clampedbetween their ends. In the construction shown pivoted at or near thecenter from which its arc is formed.

A lug 23 projects from the upper side of one of the pieces 22. A link 24connects the lug 23 with a bar 25 which passes trans- Versely purpose inplatformlO, being insulated therefrom by a suitable bushing, or in anyother manner. The'upper end of the bar 25 is connected to, but insulatedfrom, the lower end of a U-shaped armature 26. The legs of the U-shapedarmature 26 pass axiall" into one each of a pair of tubular magnet coils28. These magnet coils, which may be of ordinary construction, have lugs29 projecting from their end ieces 30. Suitable screws passing througthese In S secure the magnet coils to the tube sectlon 8. One member 31of a dash pot 31 is secured to the under side of the armature 26. The

the dash pot is secured to the platform 10. The two members of the dashgot are arranged to prevent a rapid movement of the armature 2-6,

other member 32 of without hindering the upward movement of the lamp. 7

A bracket 33 is secured to, but insulated from, the upper end of thetube section. A rod 34 extends from the under side of the bracket 33toward the platform '10. The lower end of the rod 34 is directlyconnected to a washer or plate 35 which is. secured to, but insulatedfrom, the platform 10, by a similar plate 36 of insulating material. A

rod 37 also extends down from the bracket 33parallel to the rod 34. Therod 37, which may be secured to the bracket in a suitable manner, as bya threaded downwardthrough apertures formed for the purpose in platform10, and plates 35 and 36. A tube 38 surrounds the major portion of therod 37 which forms a ide upon which the tube may be movedlongitudinally. An arm 39 extending at right angles from the lower endof the tube 38 carries at its outer end a socket in which the consummgnegative electrode 40 is held in line with the axis of the tube sections3, 8 and 12. The electrode preferably is formed out of, or contains,some material such as the magnetic oxid of iron, titanium carbid, orother material giving a flaming or luminous are.

n arm 41 is clamped to the upper end of the tube 38. The outer end ofthe arm 41 is bifurcated and the bifurcations straddle the rod 34. Thearm 41 forms a means for preventing rotation of the tube 38 and consetheelectrode is through an opening formed for the connection, passes quentangular displacement of the electrode 40 about said tube. '1

A clutch 45 of ordinary construction eonnects the armature 26 and thetube 38. The tubular yoke 46 of the clutch 45 surrounds the tube 38, andthe pawl 47 of the clutch is pivoted thereto. One end of the pawl isprovided with an aperture through which the shank 31 of the dash potmember 31 passes. The other .end of the pawl is adapted to firmly engageand lift the tube 38 in the or dinary manner when the armature 26 israised. A second clutch49 comprises a yoke 50, which surrounds the tube38 and a pawl 51 pivoted to the yoke. The inner end of whenever theouter end of the pawl is elevated. One end ofa long helical spring 52 issecured to the outer end of thepawl 51. The other end of the s iring 52is secured to a lug, which depends from the bracket 33. The spring 52normally holds the pawl 51 in such position that its inner end enga esthe tube 38! The pawl 51 is preferably ormed with an aperture throughwhich the'rod 34 passes. This prevents angular displacement of theclutch.

A member 53 is adjustably secured to the rod 34. This member is providedwith a bifurcated extension 54\ which straddles the tube 38. The uppersurface of the extension 54forms a stop, against which the yoke 46 ofthe clutch 45 rests when the armature 26'is at the lower limit of itsmovement. The member 53 is provided. at its under side a lug 55 whichforms a stop against which the outer end of the pawl 51 lmpinges whenthe tube 38 is given a suflicient upward movement. This impingementcauses the clutch to release the tube 38. An adjustable collar 56 ismounted u on the rod 34 against the upper side-of w ich the outer end ofthe pawl 51 normally rests.

A tube 57 surrounds the tube 38. The upper end of the tube 57 isprovided with an with from dropping through the washer 35, and theplatform 10. The tube57'is arranged to telescope orslide on the tube 38.The tube. 57 ma be forced upward against the underside 0 the yoke 50 tocause the clutch 49 to release the tube 38 whenever it may be desirable,as in trimming the lamp.

A vertical ma' net coil 60 is mounted on the-upper side of the platform10. The armature 61 for the magnet coil is carried by one endof an arm62 pivoted intermediate its ends in lugs 63 projecting upwardly from anextension to the end-piece 64 of the magnet. A terminal or contactmember, such as outer end of the extension 62, and a similar terminal 66is en the coil 60 is not energized the electrodes 65 and 66 engage underthe action of carried by the extension 64;

a spring 62, see Fig. 3. When the coil 60 is energized. and the armature62-is attracted the contacts 65 and 66 separate. The clamps which holdthe contact members 65 and 66 are insulated'from the extension and armin any suitable manner, as indicated at 67 and 68 respectively.

10. A coil 70 having its axis horizontal is carried at the upper end ofthe tube section 8 by brackets 71 connected to 0 posite sides of thetube section. One end oi a co6perating armature 72 is pivoted to the endpiece 7 3 of the magnet. The other end of the armature carries aninsulated contact 7 5, which cooperates witha contact 76 carried by, andinsulated from, the other end piece 74 of the magnet 70. hen the magnetcoil 70 is exc1ted by the proper current the armature will be attractedand the contactswill en age for a purpose to be hereinafter describe Acasing 77, whichmay be formed out of sheet metal, surrounds the lampmechanism located between the member 6 and platform 10. This casing iscarried from the member 6 in any suitable manner, as by means of screws78, which pass transversely through a down-turned flange 6 formed on themember 6. Thelower end of the casing closely surrounds the platform 10.For the purpose of ventilating the lamp mechanism a series ofperforations or apertures 79 may be formed in a belt around the lowerend of the casing 77. A suitable annular hood 8 0 is carried by thelower end of the casing so as to prevent dust orwater from entering thecasing through these apertures. Another annular hood or member 81 iscarried bythe casing 77 below the hood 80. Suitable screws 82 passingtransversely through the annular member 81 serve as a means forsecuringa transparent or translucent globe 83in place. The globe 83 maybe formed withlan opening at the bottom normally closed by tachablysecured to the globe for that purpose. In order to secure a properamount of i ventilation in theglobe 83 an opening 85Imay be formed inmem ber '84. In addition to the opening 84, ventilating passages-mayoli' the globe 83 with'the member 8 1, and at the juncture of hood 82.

the globe 83 with the described in The lamp shown and detail-is intendedfor operation on a constant current circuit. The various circuits of thelamp, which are shown in the diagram in F 1g. 4, are

as follows: A'conductor 88 extending from a 7 binding post 87 carried bythe member 6 and forming one terminal nected at the point 88 to oneterminal of the two coils 28, which are in series with each other. Anelectrical connection between the point'8'8 and the electrode 40 isindicatedin the diagram by the line 89. In the lamp as actually built aflexible conductor 89 ex- A resistance spool 69 is also 1 mounted on theupper side of the platform a member 84 de-' be arofthe lamp, is con-' isshown in Fig.

tends from the point 88 to the arm or bracket 11 carried at the upperend of the tube 38 which is in fixed metallic connection with theelectrode 40 through the arm and'socket at its lower end. binding post86, also carried by the member 6 and forming the other terminal of thelamp,

with one terminal of coil 60. The other ter-. minal of coil 60 isconnected to one of the screws 15 by a conductor 91. An elctricalconnection between the screw 15 and the electrode 21 indicated in thediagram by the conductor 92 is actually established by the engagement ofthe tube 12 with the screw 15 and with the bowed members 22 whichsupport the electrode 21. In addition to the ivotal connection'betweenthe bowed 1nemers 22 and the tube 12, a flexible conductor 93, havingone end clamped to the tube and the other end clamped to one of themembers 22, may be employed if desired, as shown in Figs. 1 and 2. Oneterminal of the resistance conductor 69 is connected to the conductor 90intermediate its ends at the point 9 1. A conductor 95 connects theother terminal of the resistance coil at the oint 96 with the terminalor contact member. 66. Another conductor 97 leading from the point 96connects the last-mentioned terminal of the resistance 69 and oneterminal of the coil 70. The other terminal of the coil is connected bya conductor 99 to one of the terminals of the coils 28 at the point 98.A conductor 100 leads from the point 98 to-the contact or terminalmember 65. A conductor 101 connects the contact member 7 5 to'the line90 at 101. A conductor 102 conmeets the contact member 76 to thescrew15.-

The electrodes 21 and 40 are in the position shown in Fig. 1 when thelamp is out of circuit. Under these circumstances the armature 26 willbe downjthe contacts and 76 will be se arated and the contacts 65 and 66will be he dtogether by the spring 62. When the proper circuitconnections are made with terminals 86 and 87, current willflow throughthewindings of the coils 28 causing the armature 26 to be lifted. Theupward move- A conductor 90 connects a ment of the armature 26 willcarry with it p the tube 38 and electrode 40through the in strumentalityof clutch 45. At the same time the electrode 21 will be oscillated aboutits support by the bar 25. The upward movement of the tube 38, andthereby the movement of the armature 26, will be checked by theengagement of the electrode 40 against the under surface of thearc-slmcped electrode 21. The position of the parts at the instant ofcontact between the electrodes -10 and 21 Upon the engagement betweenthe electrodes -10 and 21 current will flow between the terminals 86 and87 through the conductor90, coil 60, conductor 91, screw 15, conductor92, electrodes .21 and 40, and conductors S9 and 88.

This current ,aration of the contacts 65 and 66 and adeenergization ofthe magnet coils 28, where upon the armature 26 will return to itsinitial position. The return movement of thearmature 26 will beconsiderably slower than its upward movement, owing to the action of itsregulatin dash pot 3l-. When the yoke member of t e' clutch 45 strikesagainst the stop 54 the engagement between the clutch and the tube 38isbroken. The downward movement of the tube 38 and electrode 40 will belimited, however, by the engagement of the pawl 51 with the collar 56.During the initial upward movement of the tube 38 the clutch 45 willtravel up with it by reason of their engagement maintained by the spring52. 1f the movement of the tube 38 is great enough, however, the pawlwill strike against the lug 55 carried on the lower side of the stop 54which will cause the release of the tube 38 from its enga ement with theclutch. When, however, t e tube 38 starts downward again the clutch willimmediately engage it and will travel down with it until the pawlstrikes against the collar. It will thus be seen that the downwardmovement of the tube 38 and the electrode 40 taking place when themagnet coils 28 are deenergized will always be limited to the amount ofthe movement which the pawl can have between the stop 54 and the collar.This in the normal operation of the lamp with any given adjustment ofthe stop 54 and the collar will insure an arc ofapredetermined' length.

As lon as sufficient current flows through the coil the contacts and 66will be separated and the current flowing.

throughthe coil 28 will be insuflicient to attract the armature 26. Inaddition to the current flowing in the circuit which includes theelectrodes, current will also flow between the terminals 86 and 87through the circuit which includes the resistance coil'69, the magnetcoil 70, and the magnets 28. The magnet coil is a fine Wire coil throughwhich but a comparatively small amount of current is intended to'flow.As far as this circuit is concerned the resistance 69 and themagnet'coils 28 simply act as resistances to keep down the current flowin the circuit;

The current flowing through the windings of coil 70 will vary with thevoltage of the are. As the electrode 40' is consumed, the distancebetween its tip and the electrode 21 will in crease. As thecurrentremains constant, the voltage of the arc must increase. Inconsequence of the increase in voltage of the arc,

of the coil 70.

more current will flow through the windings signed to attract itsarmature upon a certain predetermined increase involtage of the areoccurring when the .arc increases in length a certain amount When thearmature-721's The magnet coil 70 is de- This will cause the armature2.6 to be raised until: the free end of the electrode 40 engages theunder surface of the electrode 21.

In this operation the tube 38 will be pulled' through the yoke of theclutch 45 a distance equal to the difierence between the entire u wardmovement of the tube 38 (equal to t e length of the are at the moment atwhich the movement takes place), and the play of the awl 51 between t ecollar 56 and the stop 55. V'hen the electrode 40 impinges against theunder side of the electrode-21, current will begin to flow between theelectrodes through the coil 60, causing a separation of the con tacts 65and 66 and consequent deenergization of the magnet coils 2 8, anddropping of the lower electrode in the manner hereinbefore described,

It will be noted that by reason of the oscillation of the electrode 21the-electrode 40 imipinges. against, and the arc starts from, a di erentportion of the electrode 21 from that frornwhich the arc extends duringthe normal operation of the lamp. This is an important feature, as withmany of the electrodes which we employ more or less solid matter isdeposited upon that portion of the electrode from which the arc extendsinthe normal operation of the lamp. The material deposited from suchelectrodes is usually more or less non-conducting, particularly whencold; In some cases the conductivity of the electrode 40 is quite lowwhen. the electrode is cold. The construction employed insures a contactbetween electrode 40 and a clean andhence good conducting portion of thecop er electrode 21, both at the initial starting oi the lamp andwhenever it feeds.

By arranging'the parts so that the walls of the apertures. 19 an 20 moreor-less closely embrace the electrode 21, or by 1providing auxiliaryscraingmeanasuch asls ormed by movement of t e electrode 21 osclllato takingp ace whenever the magnets 28 are- The tube. sections or chimne.members}, .,8 and 12101111 a comparatively on chimney 1s chimney ormstheor draft j tube. -Th

the aperture plate 103 secured to the mem'" ber 12 by screws 104 (see Fis. 5 and 6), the

back-bone of the lamp, all of the mechanism T of the lam The electro e21 being locate at the lower end of-the chimney, and the arcbeingsubstane being carried b or from-itthrough one or more of thefollowing spaces,

electrodes,

ing the series coil.

the opening 85, space betweenthe globe 83 and member 84, and s acebetween the globe 83 and hood 82. y varying the-size of these aperturesthe amount of air admitted can of course be regulated. The action of thedraft is highly important on account of its steadying andcentralizingaction upon the arc. The construction employed gives themaxim-um amount of draft possible with alamp of given dimensions. Theouter portion of the member 1 serves as a hood or shade to prevent dustand moisture from entering the chimney through the orifices 4.

While the lamp which we have illustrated and described in detail isparticularly adapted for use in a constant current circuit, it willreadily changes will be required to adapt the lamp for use on a constantpotential circuit as can easily be made by one skilled in the art.

Vhatwe claim as new and desire to secure by Letters Patent of the UnitedStates, is,

1. In an arc lamp, a pivoted non-consuming electrode and a secondelectrode, and means for simultaneously reciprocating said secondelectrode and oscillating the non consuming electrode; 2. In an arclamp, a air of electrodes, a coil in shunt to the arc or moving themtogether, a'coil in series with the are for deenergizing thefirst-mentioned coil, and another coil in shunt to the are for denergiz-3 In an arc lamp, 'a. central draft .tube having notches or groovesformed in its lower end, and a movable electrode adapted to pass throughsaid notches or grooves.

4. In an arc lamp, a pair of electrodes, means for moving one of saidelectrodes in a direction to lessen the distance between said and meansfor automatically moving the other of said electrodesback and forth in adirection which maintains the distance between said electrodes at eachfeeding operation of the lamp.

5. In an arc lamp, an electrode, a second electrode having a portionfrom which the are is started, and another portion from which the arc ismaintained, and a means for moving said latter electrode at each feedingoperation to causeth'e arc to be started between the first portionand'the other elecbeunderstood that only such.

trode and to-be maintained between the second portion and the otherelectrode. 6. In an arc lamp, a non-consuming positive electrode, andmeans for causing an arc to start from one portion of said non-consumingelectrode andto be maintained from another portion of said electrode.

7. In an arc lam-p, an electrode-carrying rod, a clutch membercooperating therewith,

means for moving said clutch member and thereby the rod upward againstthe action of gravity in order to feed the electrode, a second c utch.member cooperating with said rod, stops limiting the movement of saidsecond clutch member, and means for holding said second clutch member inengagement with the rod at all times except when said second clutchmember is in engagement with the stop member against which it is movedby the movement of the rod produced by said actuating clutch, the otherof said stops limiting the movement in the arc-striking direction of theclutch and thereby the rod.

8. In an arc lamp, a consuming. negative electrode, a non-consumingpositive electrode, and means for causing an are between said electrodesto extend fromone part of the non-consuming electrode at starting andstarting.

9. In an arc lamp, a feeding magnet, a. winding in series with the arefor rendering the feed magnet inoperative, and a winding in shunt to theare for rendering the series coil inoperative whenever the voltage oftheare exceeds a predetermined amount.

10. In an arc lamp, the combination of a draft tube having:diametrically opposite slots, an electrodemount'ed on the draft tube,and meansfor moving. the electrode through and in scraping engagementwith the walls of the slots. I v

11.- In anarc lam-p, anelectrode carrying memberfa clutch; actuated toengage said from another part of saidelectrode after member and to moveit in one direction, a

second clutch. actuated to release said mem' her for gravitationalmovement in the other direction and means cooperating with thefirst-named clultch'to arrest the member after gravitational movementthrough a predetermined distance;

12. In an arc lamp, an electrode-carrying member, an actuating clutchtherefor, me ans for mo-vr- :said actuating clutch and thereby the memer in one direction, said clutc member being allowed to returnto thestarting position'under the influence of gravity, and said clutch beingarranged to disengage the memberon' such'return, a second clutch playingbetween a'pair of stops, and means v, 125

tending to'hold said second clutchlalways in engagement with saidme'mber except when it engages one-of the stops between which it plays.

. member, an actuating an electrode-carrying clutch therefor, means formoving said clutch to cause it to engage said member and move it in onedirection, and a second clutch normally engaging said 13. In an arclamp,

member and playing between stops, the distance between said stops beingless than the normal movement of the actuating clutch.

14. In an arc lamp, an electrode-carrying member tending to move bygravity to es-v tablish the arc and an arc length limiting clutchcooperating therewith, fixed stops between which said clutch moves, andmeans independent of the member for holding said clutch member in enagement with. the

electrode-carrying mem er at all times exinclosing globe below Aabovesaid platform,

cept when the movement of said clutch member is checkedby its engagementwith one of said stops. v I

15. In an arc lamp, a draft tube, a consuming electrode located in linewith the axis of said tube, a non-consuming electrode located at thelower end of said tube, and means for moving it transversely of saidtube in the feeding operation of the lamp] 16; In an arc lamp, aplatform, an arc electrode feeding mechanismlocated within said casing,a' draft tube projecting through said platform with its lower endterminating just above the through said casing,

the backbone of the lamp.

normal position of the arc insaid are inclosing globe and its upper endprojecting said draft tube forming 17. In an arc lamp, a movableelectrode, a clutch for moving said electrode in one direction, a secondclutch for releasing the electrode for movement in the opposite di-'spect to the line of movement of the negative electrode.

20. In an arc lamp, a negative consuming electrode movable in 'thedirection of its tive electrode the arcing surface said platform, acasing length, a positive non-consuming electrode movable transverselyto the line of movement of the negative electrode, and means forautomatically moving said electrodes in the manner described to start anare between the negative electrode and one portion of the positiveelectrode, and to cause said are to be normally maintained between thenegative electrode and a second portion of said positive electrode. 4 v

21. In an arc lamp, a draft tube or chimney having an aperture formed init, an electrode in the form of an arc, shaped bar pivotally connectedto the draft tube or chimney number and passing through said aperture,and a feeding mechanism for starting and drawing an are from saidelectrode, said feeding mechanism comprising means for causing thenormal arcing portion of the electrode to be moved out of and back intosaid draft tube or chimney member at each feeding operation.

22. In an arc lamp, a negative electrode movable in the direction of itslength, aposiof which ismovabletransversely to the line of movement ofthe negative electrode, a device for cleaning the arcing surface of thepositive electrode, and a feeding mechanism for moving the negativeelectrode in the direction of its length and for moving the positiveelectrode so that its arcing surface is brought jnto'oontact with thecleaning device at each feedin operation.

23 n an arc lamp, a negative electrode movable in the direction of itslength, a positive non-consuming electrode, a cleaning device, a feedingmechanism for bringing about an engagement between the electrodes tostart an are, said feeding mechanism comprising means for producmg arelative .movement between the positive electrode feeding and thecleaning device at each operation whereby the portion of the posi-' t veelectrode from which an are normally extends is cleaned at each feedingoperation of the lamp. r

In witness whereof, we have hereunto set our hands this twelfth day ofNovember, 1903.

RICHARD FLEMING. f CROMWELTIA. B. 'HALVORSON, JR. Witnesses:

DUGALD MoK. MoKILLo'r, JOHN A. McMANus.

